Rotary pump



Nov. 22, 193s. H A THRUSH 2,137,791

ROTARY PUMP Filed Dec. 7, 1934 lll,

5&9. 4

Imc/nm Patented Nov. 22, 1938 UNIITEDl STATES' PATENT orf-icaA ROTARY PUMP tion of Indiana Application December 7, 1934, Serial No. 756,557

2 Claims. (Cl. ID3-97) This invention relates to pumps, and more particularly to fluid pumps of the rotary-impeller type.

It is an object of the invention to provide a simple and eihcient pump of this character adapted to be inserted in a system of piping such, by way of illustration, as a heating system to circulate uid through the system. A pump is useful in such systems employing furnaces of the type wherein the heat input to the boiler may be relatively large when a supply of heat is required,

as for example in systems utilizing an oil burner,

as the boiler heat input is rapidly transferred by circulation of the fluid to the heating radiators or other appliances connected to the piping system. Obviously the pump is capable of other uses however and may be utilized in various fluidcirculating systems.

Another object of the invention is to reduce the noise and vibration resulting from the use of a high-speed driving motor, such as an electric motor, since the fluid in the system transmits such noise and vibration throughout the system. In the case of a heating system it is possible by the use of the invention to reduce the noise in the piping and heating radiators to a point where Kit is inaudible.

A further object of the invention Is to improve the construction of the drive mechanism of a rotary device, as a pump. particularly with reference to the connection between the drive shaft and the shaft of the pump or driven device.

A further object of the invention is to provide a rotary pump with improved means for varying the capacity or the volume of uid circulated thereby.

A further object of the invention is to provide a rotary pump of improved construction embodying a rotary impeller which is readily adjustable in relation to the pump casing.

A still further object of the invention is to improve the details of construction of a pump embodying a rotary impeller, including a compact pump easing provided with inlet and outhot-water circulator embodying the invention,

y the pump casing and motor supporting bracket being shown in section;

Fig. 2, a sectional view through the pump casing on the 'line 2--2 of Fig. 1;

Fig. 3, a similar view on the line 3-3 of Fig. 1; and

Fig. 4, a detail view to an enlarged scale of one end of the flexible coupling.

Referring to the drawing, the rotary pump shown comprises a casing Ill having a central cavity forming an impeller housing containing thel rotary impeller II, said casing further being provided with an opening I2 in the side wall thereof through which the shaft I 3 of the impeller projects. A closure member I4 overlies the opening I2 and is provided with a bearing I5 for the rotatable impeller shaft I3. Suitable packing means as indicated at I6 and I1 is provided to prevent leakage from the pump casing around the impeller shaft. A gasket I8 of lead or any other suitable material may be interposed between the closure member I4 and the pump casing. This gasket I8 seals the casing .against leakage and, as any gasket of like char-- acter would do, acts to a certain extent to deaden sound and vibration between the closure members and the casing. Suitable lubricating means such as the grease cup I9 is provided for the bearing I5.

'I'he closure member Il is further provided with integral motor supports including the brackets 20 extending outwardly and substantially par allel to the impeller shaft I 3. In the construction shown, three equally spaced brackets 20 are provided but obviously the arrangement and form of the bracket may be widely varied if desired. A motor 2|, such as a single-phase or polyphase induction motor, is carried on the bracket support, the shaft 22 of said motor being connected through a flexible coupling 23 with the impeller shaft I3 of the pump. A series of coiled springs 24 are disposed between the motor 2l and the supporting bracket 20 in order to prevent the noise and vibration of'the motor from being transmitted to the impeller II and to .insure constant alignment of the motor shaft with that of the impeller. I Three or more sets of springs 24 may be provided, equally spaced around the shaft 22 and each set comprising -two springs surrounding a bolt 25 which is in turn threaded into a plate member 26 upon the motor 2l.

Since the bolts 25 are rigid with respect to the c motor, but are yleldingly supported with respect to the bracket 20, it is evident that the motor shaft and also radially thereof to a limited extent. 'It is found that by supporting the motor in this manner and connecting the same to thepump impeller through a resilient driving connection as indicated at 23, the noise and vibration of the pump and driving motor are reduced to such an extent as to be inaudible in rooms having hot-water heating radiators connected to the piping system in which the pump is arranged.

It is also found thatthe life of the pump is substantially increased, as heretofore ditilculty has been encountered in connection with the bearing for the impeller shaft. The impeller is rotated at high speed by reason of its direct connection to an ordinary high-speed electric motor, and a slight disalignment of the motor and impeller resulted in rapid wear of the bearings, causing vibration and noise which necessitated an early replacement of the pump.

The ilexible coupling 23 may comprise a coil spring secured at the ends to the collars 30 and 3| adapted to be clamped to the impeller shaft and motor shaft respectively, as for example, by means of set screws 32. As shown in Fig. 4, the end of the spring 23 extends into a recess in the end of the collar 3l and the lip or edge of the recess may be swaged over the end of the spring, as indicated at 33. Either of the collars 30 or 3l may be adjusted in relation to the shaft I3 or 22 by loosening set screw 32 with a wrench 34.

The impeller Il is adjustable in the impeller housing as indicated in dotted lines in Fig. l. The position of the impeller is determined by the location of the collars 30 and 3l on the shafts i3 and 22, since the iiexible coupling 23 has a deiinite normal length in the direction of the axis of the impeller during operation. The axial adjustment of the impeller Il in the pump casing changes the capacity or volume of the liquid handled by the pump and thus the capacity of the pump may be readily adjusted by moving one or both of the collars 30 and 3| along their respective shafts.

The pump casing l0 may be variously modied ln form and size but a preferred form which is compact and satisfactory in operation is illustrated in the drawing. As shown, the casing is provided with diametrically opposed flanged portions 36 and 31 surrounding inlet openings 38 and 39 and outlet openings 40 and 4I, respectively. The inlet openings 38 and 39 are separated by a central partition member 42 and the outlet openings by a similar partition member 43. The upper inlet opening 38 communicates with the [said bypass to prevent backward circulating fluid therethrough. If the pump is not operating, fluid may circulate through said bypass in the normal direction of flow through the pump. As shown in Fig. 1, the flanged portions 36 and 31 may be provided with threaded coupling members 46 and 41 in order to connect the pump in the piping system. The coupling members 46 and 41 are bolted or secured in any desired manner to the anged ends 36 and 31 of the pump casing.

Various modifications in the construction shown and described above will occur to those skilled in the art and may be made without departing from the scope of the invention as deiined in the appendedclaims.

I claimsl. A rotary pump comprising a casing having diametrically opposed inlet and outlet openings and an intermediate impeller housing, a rotatable impeller in said housing, said inlet and outlet openings being divided by partitions substantially perpendicular to the axis of said impeller to form separate fluid passages at each end of the casing, said casing being provided with fluid passages connecting the upper of said separate passages at one end and the lower of said separate passages at the other end of said casing to said impeller housing and provided with a bypass passage around the impeller housing connecting the remaining separate passages, and a check valve in said by-pass passage.

-2. A rotary pump comprising a casing having an impeller housing formed therein, inlet-and -outlet openings, longitudinal inlet and outlet fluid passages communicating with said inlet and outlet openings respectively and with said impeller housing, and a lay-pass passage extending between said inlet and outlet openings including longitudinal inlet and outlet fluid passages communicating with each other through said casing 4 HOMER A. THRUSH. 

